The output transistors can be BC548 and BC558. The circuit is from a 1975 documentation showing a frequency response from 90 Hz to 12.5 kHz.
This version works in the opposite way to the previous one, activating when the light falls on the...
This circuit is from a 1982 publication. This is a way to stop 4017 at the end of a counting...
Panasonic is delivering through its Mouser Electronics its CSP series of power MOSFETs in a range...